Thick Battery Electrode Structuring for Adhesion and Ion Transport
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for forming thick electrodes in lithium-ion batteries face issues such as delamination from the current collector, uneven surfaces, and tortuous pathways, leading to mechanical instability and reduced cyclability.
Innovation Solution
The use of laser etching to create structured patterns on current collectors and electrodes, combined with electrical field application during casting and drying, to ensure uniformity and improve adhesion, while reducing ion transport distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If thick electrodes are formed using traditional casting methods, then volumetric energy density is improved, but mechanical stability deteriorates due to delamination from current collector
Solution Approach 1:
The current collector surface is pre-structured with micro-patterns (grooves, pillars, or roughened surfaces) before electrode casting. This preliminary surface modification creates mechanical interlocking features that prevent delamination during subsequent drying and cycling, allowing thick electrodes to maintain mechanical stability while achieving high volumetric energy density
Solution Approach 2:
The electrode structure is made non-uniform with varying local properties - denser regions for energy storage and porous regions for electrolyte penetration. This local quality variation allows thick electrodes to maintain structural integrity while facilitating ion transport, resolving the contradiction between thickness (energy density) and mechanical stability
2Length of stationary object
If high viscosity slurry is used to form thick electrodes, then electrode thickness is improved, but surface uniformity deteriorates
Solution Approach 1:
The electrode is formed in multiple thin layers through sequential casting rather than a single thick layer. Each thin layer maintains surface uniformity, and the cumulative effect achieves the desired total thickness. This segmentation approach allows thick electrodes to be constructed while preserving surface uniformity at each layer
Solution Approach 2:
The slurry viscosity and casting parameters are optimized and adjusted during the multi-layer formation process. By controlling drying conditions, casting speed, and slurry composition for each layer, uniform surfaces are achieved while building up the required electrode thickness
3Quantity of substance
If thick electrodes are formed without structured pathways, then volumetric energy density is improved, but ion transport efficiency deteriorates due to tortuous pathways
Solution Approach 1:
The electrode is divided into functional regions with different densities and porosities. Dense regions provide high energy density, while interconnected porous channels provide direct ion transport pathways. This segmentation allows thick electrodes to achieve both high volumetric energy density and efficient ion transport by separating these two functions spatially
Solution Approach 2:
Different regions of the thick electrode have locally optimized properties - some regions are denser for energy storage while others are more porous for ion transport. This local quality variation enables the electrode to simultaneously achieve high volumetric energy density and maintain efficient ion transport pathways throughout the thickness
4Strength
If laser etching is applied to current collector, then adhesion is improved, but device complexity increases
Solution Approach 1:
Traditional mechanical surface roughening methods are replaced with laser-based structuring. The laser provides precise, contactless surface modification that creates adhesion-promoting micro-patterns without mechanical tooling, reducing overall device complexity while improving adhesion strength
Solution Approach 2:
Laser parameters (power, speed, pattern) are optimized to create specific surface structures that maximize adhesion. By controlling these parameters, the laser process achieves strong bonding without requiring additional materials or complex processing steps, resolving the contradiction between adhesion improvement and processing complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances mechanical stability, increases surface area, and improves ion transport efficiency, resulting in higher volumetric energy density and extended battery performance.
Implementation Method 1
applying an electrical field during casting and drying
Implementation Method 2
drying to form the electrode with the application of an electrical field
Implementation Method 3
laser structuring of the electrodes
Data Source
AI summary
High-density thick electrodes are provided for forming a battery. The electrodes may be formed by laser structuring a pattern on a current collector surface, casting an electrode material slurry on the current collector surface to form a wet intermediate electrode, drying the wet intermediated electrode to form the electrode, shaping the electrode, and laser structuring the electrode to include an interdigitated pattern and one or more ion transport routes. An electric field may be applied during casting and drying to aid in particle alignment.